Even assuming the manufacturer is refusing to negotiate lower prices with resellers..

The first sale doctrine protects your right to sell items that you've purchased... even if you want to price it at a loss.

Amazon, for example, sold ebooks at a loss for years. Obviously you wouldn't say Amazon's ebooks were counterfeit or stolen.

And Amazon does not have sole ownership of that tactic. Others have an equal right to sell items at a loss, even against the manufacturers wishes.

Other examples of when this occurs: going out of business sales; end of season liquidations; etc. and various reasons to liquidate inventory: bad buys; changing product categories; etc.

Or, someone got the item as a gift and never wanted it. I've gotten tons of stuff for far cheaper than buying direct that way.

That doesn't apply when someone has a large quantity, though. Many of those sellers have thousands of feedback, unless they have a large number of friends, it's not from gifts.

Or it could be a money laundry operation?

If you had clicked the link, you would understand why that's not the case.

If only you had bothered reading this little thread...

Or second hand